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Ruby wrapper for the libbuffy library

Buffy wants to be the ultimate mail folder summary system.

This library provides efficient mailfolder checking routines, packaged in a
library with a simple API and with wrappers for many languages, so that
everyone can create mail folder summary systems in the language they prefer
without having to care about the actual mailbox checking.

Libbuffy currently supports detection and summarizing of folders in Maildir
and Mailbox format.